Jolla doesn't repair phones by themself.
They have or had agreement with mobylife.fi
Here you have a contact mail huolto@mobylife.fi.
I don't know how old yours Jolla is but this company wrote me that Jolla phone has 2 years warranty.
"If the phone hasn't suffer any physical or liquid damage and it's less> than 2 years old we can provide the service into Jolla's warranty. If its> not a warranty case we would do price estimate for the service."